Ulmus × hollandica 'Belgica'
…Hollandse iep' (:'Dutch elm') in these countries, as distinct from the tree known as 'Dutch Elm' in Great Britain and Ireland since the 17th century: Ulmus × hollandica 'Major'. In Francophone Belgium it was known as orme gras de Malines. 'Belgica' arose in the same hybridization zone that produced 'Ypreau' (possibly synonymous…